RFR: 8340010: Fix vectorization tests with compact headers [v2]

[Roberto Castañeda Lozano]

On Thu, 21 Nov 2024 11:13:12 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> That is why I wrote this comment:
>> `// Subword vector casts do not work currently, see JDK-8342095.`
>> But I can extend the comment if you like.
>
> I see, thanks for explanation!

Thanks for extending the comment, Emanuel!

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PR Review Comment: https://git.openjdk.org/jdk/pull/22199#discussion_r1851942008